NOOSE is called upon to assist the police when the player has a wanted level of at least 4 stars, before the FIB. Patriotism and Immigration Authority officers are largely similar to the LCPD's in behavior, weapons, appearance and mannerisms. Tactical Response officers, however, are designed to appear as fully equipped tactical squad units, with heavy armor and weaponry.

NOOSE's vehicle fleet consists of modified Police Cruisers, Patriots, Enforcers, Annihilators, and Armored Personnel Carriers. The NOOSE Cruisers and Patriots are exclusively driven by Patriotism and Immigration Authority officers, while the Enforcers and the APCs are used solely by the Tactical Response Unit. The Annihilator may appear with occupants from either division, depending on who is pursuing the player on the ground.

Basic Behavior

After the suspect is killed or arrested, NOOSE Officers will remain in the area combat readied for at least 5 minutes real-time. This is true to reality, as SWAT Officers and other law enforcements are trained to remain at crime scenes in case there is another potentially dangerous suspect.

Tactical Response officers are well protected with body armor and don't lose health very quickly. Despite being more resilient to damage, Tactical Response officers are slightly less accurate than FIB Agents. Even with body armor, like all pedestrians, a single headshot instantly kills them.

Agents always use good cover (e.g. behind a car, behind a wall, inside their helicopter).

Tactical Response officers usually move together as a unit and pursue the player more aggressively than LCPD officers on foot.

All Tactical units are always in a crouched position making it harder to get a headshot.

Like the FIB, NOOSE Units will sometimes disappear off camera when the player has no wanted level.

Tactical Response Unit officers have a signature walking style, known as "move m@swat", in which they will walk in a crouched position, and will position their hands as if they were holding a Carbine Rifle, even after the player has lost his or her wanted level.

NOOSE teams will also hide in unseen places to capture the suspect when he/she is off guard.

Indoors, a NOOSE officer's footsteps can be clearly heard and distinguised from other police forces due to their fast movement. This can be used effectively to anticipate the NOOSE officer's approach.

Trivia

A noose is a type of self-tightening knot, most commonly known for the Hangman's knot used in public hangings. A reference to the Hangman's knot is the one is depicted on the eagle's shield within the NOOSE seal.